Biomass-derived carbon decorated with Ni0.5Co0.5Fe2O4 particles towards excellent microwave absorption performance

Searching for high efficiency microwave absorbers is to meet the requirements of elimination of electromagnetic pollution. Herein, the Ni0.5Co0.5Fe2O4 decorated pomelo peel-carbon microwave absorber with uniform particle size was prepared by a facile physical blending method. The skeleton structure formed by biomass carbon (BC) can not only effectively improve the conductive loss, but also extend the propagation path of electromagnetic waves. Besides, the absorber with a great quantity defects and heterogeneous interfaces delivers interfacial polarization and dipole polarization. Also, the Ni0.5Co0.5Fe2O4 particles with good dispersion on BC are beneficial toward dielectric-magnetic combination, resulting in impedance matching. The minimum reflection loss (RL) reaches-41.6 dB and the effective absorption bandwidth (EAB) (RL <-10 dB) is 4.3 GHz with the thickness of 3 mm. This work will promise a good approach to accomplish high performance of microwave absorption.

Automated summary

In this study, a high-efficiency microwave absorber was prepared by decorating pomelo peel-carbon with Ni0.5Co0.5Fe2O4 particles using a simple physical blending method. The absorber exhibited a skeleton structure formed by biomass carbon (BC), which improved the conductive loss and extended the propagation path of electromagnetic waves. The absorber also had a high quantity of defects and heterogeneous interfaces, which contributed to interfacial polarization and dipole polarization. Additionally, the good dispersion of Ni0.5Co0.5Fe2O4 particles on BC facilitated the combination of dielectric and magnetic properties, resulting in impedance matching.